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Add together the lengths of the 4 sides, or you could add the length of one shorter side to one longer side and then double it. e.g. Perimeter of parallelogram = l = b = l = b, or 2(l + b)
The equation is: nλ=d(x/l) where: n is Order of maxima λ is wavelength d is slit separation x is fringe separation l is distance from screen to double slit
It says 'til the mornin bananas' and then 'til the sun come up'
The double of one half of 11 can be calculated by first finding one half of 11, which is 5.5. Then, doubling that value gives you 11. Therefore, the double of one half of 11 is 11.